The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa
Concentrations and flux densities of methane were determined during a lagrangian study of an advective filament in the permanent upwelling region off western Mauritania. Newly upwelled waters were dominated by the presence of North Atlantic Central Water and surface CH4 concentrations of 2.2 ± 0.3 n...
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ftplymouthml:oai:plymsea.ac.uk:6149 2023-05-15T17:33:30+02:00 The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa Brown, IJ Torres, R Rees, AP 2014-09-01 text http://plymsea.ac.uk/id/eprint/6149/ http://plymsea.ac.uk/id/eprint/6149/1/Brown%20et%20al%20Review.pdf https://doi.org/10.1016/j.dynatmoce.2014.06.001 en eng Elsevier http://plymsea.ac.uk/id/eprint/6149/1/Brown%20et%20al%20Review.pdf Brown, IJ; Torres, R; Rees, AP. 2014 The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa. Dynamics of Atmospheres and Oceans. https://doi.org/10.1016/j.dynatmoce.2014.06.001 <https://doi.org/10.1016/j.dynatmoce.2014.06.001> cc_by_nc_nd_4 CC-BY-NC-ND Atmospheric Sciences Marine Sciences Oceanography Publication - Article PeerReviewed 2014 ftplymouthml https://doi.org/10.1016/j.dynatmoce.2014.06.001 2022-09-13T05:48:32Z Concentrations and flux densities of methane were determined during a lagrangian study of an advective filament in the permanent upwelling region off western Mauritania. Newly upwelled waters were dominated by the presence of North Atlantic Central Water and surface CH4 concentrations of 2.2 ± 0.3 nmol L-1 were largely in equilibrium with atmospheric values, with surface saturations of 101.7 ± 14%. As the upwelling filament aged and was advected offshore, CH4 enriched South Atlantic Central Water from intermediate depths of 100 to 350m was entrained into the surface mixed layer of the filament following intense mixing associated with the shelf break. Surface saturations increased to 198.9 ± 15% and flux densities increased from a mean value over the shelf of 2.0 ± 1.1 µmol m-2d-1 to a maximum of 22.6 µmol m-2d-1. Annual CH4 emissions for this persistent filament were estimated at 0.77 ± 0.64 Gg which equates to a maximum of 0.35% of the global oceanic budget. This raises the known outgassing intensity of this area and highlights the importance of advecting filaments from upwelling waters as efficient vehicles for air-sea exchange. Article in Journal/Newspaper North Atlantic Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) Dynamics of Atmospheres and Oceans 67 39 46 |
institution |
Open Polar |
collection |
Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) |
op_collection_id |
ftplymouthml |
language |
English |
topic |
Atmospheric Sciences Marine Sciences Oceanography |
spellingShingle |
Atmospheric Sciences Marine Sciences Oceanography Brown, IJ Torres, R Rees, AP The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
topic_facet |
Atmospheric Sciences Marine Sciences Oceanography |
description |
Concentrations and flux densities of methane were determined during a lagrangian study of an advective filament in the permanent upwelling region off western Mauritania. Newly upwelled waters were dominated by the presence of North Atlantic Central Water and surface CH4 concentrations of 2.2 ± 0.3 nmol L-1 were largely in equilibrium with atmospheric values, with surface saturations of 101.7 ± 14%. As the upwelling filament aged and was advected offshore, CH4 enriched South Atlantic Central Water from intermediate depths of 100 to 350m was entrained into the surface mixed layer of the filament following intense mixing associated with the shelf break. Surface saturations increased to 198.9 ± 15% and flux densities increased from a mean value over the shelf of 2.0 ± 1.1 µmol m-2d-1 to a maximum of 22.6 µmol m-2d-1. Annual CH4 emissions for this persistent filament were estimated at 0.77 ± 0.64 Gg which equates to a maximum of 0.35% of the global oceanic budget. This raises the known outgassing intensity of this area and highlights the importance of advecting filaments from upwelling waters as efficient vehicles for air-sea exchange. |
format |
Article in Journal/Newspaper |
author |
Brown, IJ Torres, R Rees, AP |
author_facet |
Brown, IJ Torres, R Rees, AP |
author_sort |
Brown, IJ |
title |
The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
title_short |
The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
title_full |
The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
title_fullStr |
The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
title_full_unstemmed |
The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa |
title_sort |
origin of sub-surface source waters define the sea-air flux of methane in the mauritanian upwelling, nw africa |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://plymsea.ac.uk/id/eprint/6149/ http://plymsea.ac.uk/id/eprint/6149/1/Brown%20et%20al%20Review.pdf https://doi.org/10.1016/j.dynatmoce.2014.06.001 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://plymsea.ac.uk/id/eprint/6149/1/Brown%20et%20al%20Review.pdf Brown, IJ; Torres, R; Rees, AP. 2014 The origin of sub-surface source waters define the sea-air flux of methane in the Mauritanian Upwelling, NW Africa. Dynamics of Atmospheres and Oceans. https://doi.org/10.1016/j.dynatmoce.2014.06.001 <https://doi.org/10.1016/j.dynatmoce.2014.06.001> |
op_rights |
cc_by_nc_nd_4 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.dynatmoce.2014.06.001 |
container_title |
Dynamics of Atmospheres and Oceans |
container_volume |
67 |
container_start_page |
39 |
op_container_end_page |
46 |
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1766132027067727872 |